voltage controlled oscillators

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Voltage Controlled Oscillators. Yousef Shakhsheer 3/29/2011. VCOs. Two criteria Generates a periodic output. Needs self-sustaining oscillation mechanism;. Important Metrics. Frequency Power Tunability (Range and linearity) Jitter Figure of Merit. Three Types of Oscillators. LC-Tank - PowerPoint PPT Presentation

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Voltage Controlled Oscillators

Voltage Controlled OscillatorsYousef Shakhsheer3/29/20111VCOsTwo criteriaGenerates a periodic output.Needs self-sustaining oscillation mechanism;

2Important MetricsFrequencyPowerTunability (Range and linearity)JitterFigure of Merit3Three Types of OscillatorsLC-Tank

Ring oscillator

Crystal Oscillator4

4Important IssuesInductors - inductance modeling and modeling of losses. TopologyVaractors - TopologyProcess Variation Temperature

5

[1] A Sub-1V 4-GHz CMOS VCO and a 12.5-GHz Oscillator for Low-Voltage and High-Frequency

Ahmed H. Mostafa, Mourad N. El-Gamal,& Ramez A. Rafla6

7Mostafa et al, A Sub-1V 4-GHz CMOS VCO and a 12.5-GHz Oscillator for Low-Voltage and High-Frequency7Topologies4-,5- GHzVaractor Tuning10.5-,12.5- GHzBack-gate Tuning

8Mostafa et al, A Sub-1V 4-GHz CMOS VCO and a 12.5-GHz Oscillator for Low-Voltage and High-FrequencyBoth use cross coupled differential amplifiers8[2] 1-V Ultra-Low-Power CMOS LC VCO for UHF Quadrature Signal GenerationZheng Wang, Huseyin S. Savci, Numan S. Dogan9Proposed Topology10

Wang et al, 1-V Ultra-Low-Power CMOS LC VCO for UHFQuadrature Signal Generation11

Wang et al, 1-V Ultra-Low-Power CMOS LC VCO for UHFQuadrature Signal Generation[3] A Low-Complexity, Low-Phase-Noise, Low-Voltage Phase-Aligned Ring Oscillator in 90 nm Digital CMOSJonathan Borremans, Julien Ryckaert, Claude Desset, Maarten Kuijk, Piet Wambacq, and Jan Craninckx, 12Ring OscillatorsProblem:Inductors are hard to designJitter added over time in ring oscillatorRing Oscillator:Reset to reduce jitter, noise, power, etcVery simple circuitry

13Borremans et al, A Low-Complexity, Low-Phase-Noise, Low-Voltage Phase-Aligned Ring Oscillator in 90 nm Digital CMOSResults

14Borremans et al, A Low-Complexity, Low-Phase-Noise, Low-Voltage Phase-Aligned Ring Oscillator in 90 nm Digital CMOS[4] A Low-Power, Process-and-Temperature-Compensated Ring Oscillator With Addition-Based Current SourceXuan Zhang, and Alyssa B. Apsel15PVT Variation16

Change from single transistor to current source for PVT

Zhang et al, A Low-Power, Process-and-Temperature-Compensated Ring Oscillator With Addition-Based Current Source17

Zhang et al, A Low-Power, Process-and-Temperature-Compensated Ring Oscillator With Addition-Based Current SourceVariation18

Zhang et al, A Low-Power, Process-and-Temperature-Compensated Ring Oscillator With Addition-Based Current Source[5] Low-Voltage, Low-Power and Low Phase Noise 2.4 GHz VCO for Medical Wireless TelemetryAhmed Fakhr, M. Jamal Deen and Hubert deBruin19Fakhr et al, Low-Voltage, Low-Power and Low Phase Noise 2.4 GHz VCO for Medical Wireless TelemetrySub - VT20

Fakhr et al, Low-Voltage, Low-Power and Low Phase Noise 2.4 GHz VCO for Medical Wireless TelemetrySub-VT21

Fakhr et al, Low-Voltage, Low-Power and Low Phase Noise 2.4 GHz VCO for Medical Wireless TelemetryCrystal8.0 MHz - 50.0 MHz

10 - 100 W

http://www.abracon.com/Resonators/abm3b.pdf22

22Summing it all up[1][2][3][4][5]Technology.25 um.180 um.090 um.090 um.180 umVoltage.85 V1 V.5 V1 V.4 VMax Freq4 GHz1.6 GHz400 MHz1.8 GHz2.4 GHzPhase Noise-84.7 @ 100 KHz-121 @ 1 MHz-119 @ 200 Hz-109.76 @ 10 MHz-123 @ 1 MHzPower4.08 mW105 uW1.8 mW87 uW41 uW23Other Good ResourcesRazavis BookPerrotts slides24

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